I would understand seeded to mean 'with seeds', though I can see how its a bit ambiguous. Sorry about your tooth, though its unlikely to have done any permanent damage unless you had a weak spot anyway. More to the point, please don't sue, or even think of it - litigation is like global warming, it might produce a short term advantage to some, but in the long term it is doing terrible damage to society.

Interesting topic. When I see signs for "seedless grapes" I assume that the grapes are seedless or has tiny edible seed as you had mentioned. When it simply say "grapes" I generally assume it means it has seeds. And when it says "Seeded grapes" (which I rarely see here), I tend to take it to mean that they have seeds in them. Honky big ones. :o) Sorry to hear about your mishap though.

At first glance, 'seeded' would make me think 'seedless'. In markets around here, they generally use 'seedless' when marketing grapes without seeds. Too bad about the dental issue. Maybe you should sue for false advertising; or at least confusing advertising.